Damper-regulator



W; E. KELLY. DAMPER REGULATOR.

NoT 247,064. Pamed sept. 18.1881.

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UNITED STAT'ES PATENT OFFICE WILLIAM E. KELLY, OF NEW BRUNSWICK,NEWVJERSEY.

DAM PER-REGULATOR.

SPECIFIGATION formng' part of Letters Patent No. 247,064, datedSeptember 13, 1 881.

' Application filed December 26, 18 78. Patented in England May 7, 1879.

To all whom it may concern Be it known that I, WILLIAM E. KELLY, of NewBruswick, in the county of Middlesex and the State of New Jersey, haveiuvented certain new and useful Improvelnents in Damper- Regulators, ofwhich the following is a speeification.

My inventiou relates to damper-regulators for furnaces employed inconnection with steam boilers or generators, to automatically regulatethe draft therein, and hence the condition of the fire.

Damper -regulators heretofore used have been objectionable because thevariations in the pressure of steam in the boiler or generatorv employedto actuate them have acted directly upon a motor connected with thedamper,havin g had to ovcrcome the weight and friction of the dampersbefore shiftin g them. Henee the Operations of the dampers have notbeen'so reliable or so sensitive'as were desirable.

'An important object of my invention is to overcome this difiiculty andprovide for operating dampers with the requisite power, and also to shutoff steam from the motor which actuates the damper when it is not inoperation. i o

To this end my invention consists in the combination of a damper, amotor for operating the same provided with a valve for controlling itsoperation, a supplemental motor for Operating said valve in onedirection, and a counter-balance or other means, which is preferably adjustable, for Operating said valve in the other direction. V

The invention also consists in combinations of parts and details ofconstruction, to be hereina-fter explained.

The aceompanyingdrawingrepresents a side view, partly sectional, of aboiler and furnace, and damper for controlling the draft of air to saidfurnace, and also motors for` Operating the same, embodying myimprovements.

A designates a steam boiler or generator, which may be of any desirableconstruction.v B designates the furnace bridge-wall thereof and Odesignates a damper fitted invthe smoke stack or flne, and adapted to hevibrated or oscillated in a well-known manner, to control the passage ofthe products of combustion through the stack, and thus regulate thedraft of air through the furnace.

steam.

For the purposes of my inven tion the damper for regulating air beforeentering the furnace might be used. The main motor whereby this damperis actuated consists of a cylinder, D, of suitable construction, fittedwith a piston, E, provided with a piston-rod, E', connected by a link,E2, with a bell-crank lever, E3, which is connected by a link, E4, witha crank, E5, arranged upon the damper-shaftso that the movements of thepiston effect the shifting of the damper. This motor is provided with asteam-chest, Ffto which steam from the generator or boiler'A is suppliedthrough a pipe or passage, F': Induction and exhaust ports a b establishcommunication between the steam-chest F and the cylinder 1:), ns alsobetween the latter and anlexhaust-passage; c.

G designates a valve for controlling the admission of steam from thesteam-chest F to the cylinder D, and from the latter to theexhaustpassage c. This yalve is represehted as ot' the kind known as theordinaryf D slide-valve? but may be of any other desirable form. Itisrepresented as being actuated by a snpplemental motor Operating upon itsvalve-rod G'. This supplemental motor is 'represented as consist-ing oftwo diaphragms, H, connected together by rings and bolts H','so as to beexpanded on the admission of steam between them through a pipe, Hz,leading from the boiler or generator'A. This supplemental motor may besupported from a frame or standard, d, extending from the main motor,and connected by a yoke, E3, with the valve-rod G' of the valve G,controlling the operation of the main motor. This rod G' is providedwith a counter-balance, which may consist of a weight, or lever andweight combined, but in the present instance is shown as consisting of aspiralspring,1,surrounding said valve-rod G', and fitting between an adjustable collar or nut, I', a-rranged thereon, and an arm or standard, e,extending from the main motor. Preferably this counter-balance will beso constructed that it maybe adj usted or set to regulate the action ofthe motor for any desirable pressure of In the present instance this isaccomplished by providing the valve-rod G' with an externalscrew-thread, and the collar I' with an internal screw-thread, so thatthe latter may be adjusted longitudinally thereon as a nut,

by means of awrench or other implement. The

IOO

counter-balance is adj usted so that only when steam in the boilerexceeds'a certain pressure it Will expaud the supplemental motor H H',overcome the resistance of the said counterbalance, shift theslide-valve, admit a supply of steam to the main cylinder, and cause theshifting of the damper, so that the said counter-balance, on a reductionof pressure, will overcorne the resistance ofi'ered by the supplementalmotor and shift the valve in the opposite direction, steam being thusadmitted to the cylinder of the main motor. and effecting the shiftingOf the damper O.

It is Obvious that by adjusting the counterbalance so as to increase ordecrease the force Ofthe same the action of the damper at any pressurecan be attained, and that inasmuch as the increase or decrease in thepressure of the steam has only to shift the valve in a motor forOperating the damper, and not to shit't the damper itself, asheretofore, very slight increase or decrease in pressure will sutlice toeffect the shifting of the damper, and hence, that the operation of thedamper is more sensitive, and the drat't of air to the furnace is verydelicately controlled, so as to maintain a much nearer uniform pressurein the boiler Or generator than heretofore has been done with anautomatic damper.

I do not limit myself to the form of supplemental motor ill'ustrated anddescribed, for I can with good results employ in lieu thereof a cylinderand piston Or plunger, or other suitable device or devices.

The means for precluding steam from constantly flowing into the cylinderof the main motor while such motor remains inactive, and therecondensing, I have shown as consisting of two tappet-levers, J, pivotedto a frame, J', actin g through collars f upon the valve-rod G', andactuated by a tappet-collar, g, upon thel pistOn-rod Ef. Thistappet-collar g, as the piston E nears the end of its stroke, acts uponone or otherof the tappets J, andcreverses the valve G sufficiently forit to cover the ports a b and preclude the passageof steam through theminto the cylinder D. By this feature of my invention the waste of steamincidental to its constantflowing into the motor for Operating thedamper is obviated, as also the annoyance by the accumulation therein ofWater produced by the condensation of steam and its leakage from thecylinder.

It Will be seen that by my invention I provide for Operating afurnace-damper automatically through very slightvariations of pressurein a steam boiler or generator, and therefore m aintainin g thereinavery n early uniform pressure at all times; also, that I provide foreffectin g the operation of a damper positively and reliably, no matterhow large it maybe or how great its friction, because I employvariations of pressure in the steam boiler or generator merely forshifting a valve controlling the admission of steam into a powerfnlmotor, whereby the damper is operated; also, th at I provide forprecluding the flow of steam into the cylinder Ot' the motor forOperating the damper during the time such motor remains idle, and thusavoid much waste of steam occurrin g with the use of ordinary automaticdampers.

WhatI claim as myinvention, and desire to secure by Letters Patent, is-

1. The combination, with a damper and a motor for Operating the same,provided with a valve for controlling its operation, of a supplementalmotor for Operating the said valve in one direction and acounter-balance for operating it in the Opposite direction,substantially as and for the purpose specified.

2. The combination, withpadamper and motor for Operating the same,provided With a valve for controlling its operation, of a supplementalmotor for Operating the said valve in one direction and an adjustablecounter-balance for Operating it in the opposite direction,substantially as and for the purpose specified.

3. The combination, with the damper O, of the cylinder D, piston E,steam-chest F, ports a b c, valve G, valve-rod G', motor H H',comlmunicating with the steam-generator,and counter-balance I I',connected thereto, substantially as and for the purpose specified.

4. The combination, with a motor consisting Ofa cylinder, piston, ports,and valve, of a supplemental motor for Operating said valve, and meanswhereby, after the cOmplet-ion of the stroke of the valve, it is shiftedOver such ports prior to making its return or reverse stroke.

WILLIAM E. KELLY.

Witnesses EDWIN H. BROWN, THOMAs E. BIROH.

